Finding the Fourth Proportional to 72,086.23, 99,477.07 and 39,820.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,086.23 : 99,477.07 = 39,820.15 : x
2. Step 2: Convert to fraction form
   72,086.23/99,477.07 = 39,820.15/x
3. Step 3: Cross multiply
   72,086.23x = 99,477.07 × 39,820.15
4. Step 4: Simplify right side
   72,086.23x = 3,961,191,749.41
5. Step 5: Solve for x
   x = 3,961,191,749.41/72,086.23
6. Step 6: Final answer
   x = 54,950.74