Finding the Fourth Proportional to 258,791,058.72, 388,056,780.72 and 86,207,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   258,791,058.72 : 388,056,780.72 = 86,207,196.96 : x
2. Step 2: Convert to fraction form
   258,791,058.72/388,056,780.72 = 86,207,196.96/x
3. Step 3: Cross multiply
   258,791,058.72x = 388,056,780.72 × 86,207,196.96
4. Step 4: Simplify right side
   258,791,058.72x = 33,453,287,327,192,572
5. Step 5: Solve for x
   x = 33,453,287,327,192,572/258,791,058.72
6. Step 6: Final answer
   x = 129,267,554.65