Finding the Fourth Proportional to 341,858.74, 512,788.50 and 89,139.02

Step by Step Solution

1. Step 1: Write the proportion equation
   341,858.74 : 512,788.50 = 89,139.02 : x
2. Step 2: Convert to fraction form
   341,858.74/512,788.50 = 89,139.02/x
3. Step 3: Cross multiply
   341,858.74x = 512,788.50 × 89,139.02
4. Step 4: Simplify right side
   341,858.74x = 45,709,463,705.95
5. Step 5: Solve for x
   x = 45,709,463,705.95/341,858.74
6. Step 6: Final answer
   x = 133,708.63