Finding the Fourth Proportional to 387,820,486.72, 581,687,758.00 and 138,815,799.07

Step by Step Solution

1. Step 1: Write the proportion equation
   387,820,486.72 : 581,687,758.00 = 138,815,799.07 : x
2. Step 2: Convert to fraction form
   387,820,486.72/581,687,758.00 = 138,815,799.07/x
3. Step 3: Cross multiply
   387,820,486.72x = 581,687,758.00 × 138,815,799.07
4. Step 4: Simplify right side
   387,820,486.72x = 80,747,450,932,404,272
5. Step 5: Solve for x
   x = 80,747,450,932,404,272/387,820,486.72
6. Step 6: Final answer
   x = 208,208,317.25