Finding the Fourth Proportional to 258,189.30, 387,167.31 and 91,981.62

Step by Step Solution

1. Step 1: Write the proportion equation
   258,189.30 : 387,167.31 = 91,981.62 : x
2. Step 2: Convert to fraction form
   258,189.30/387,167.31 = 91,981.62/x
3. Step 3: Cross multiply
   258,189.30x = 387,167.31 × 91,981.62
4. Step 4: Simplify right side
   258,189.30x = 35,612,276,384.84
5. Step 5: Solve for x
   x = 35,612,276,384.84/258,189.30
6. Step 6: Final answer
   x = 137,930.88