Finding the Fourth Proportional to 257,787, 386,588.24 and 89,262.10

Step by Step Solution

1. Step 1: Write the proportion equation
   257,787 : 386,588.24 = 89,262.10 : x
2. Step 2: Convert to fraction form
   257,787/386,588.24 = 89,262.10/x
3. Step 3: Cross multiply
   257,787x = 386,588.24 × 89,262.10
4. Step 4: Simplify right side
   257,787x = 34,507,675,758.45
5. Step 5: Solve for x
   x = 34,507,675,758.45/257,787
6. Step 6: Final answer
   x = 133,861.19