Finding the Fourth Proportional to 86,078.90, 129,122.69 and 61,047.47

Step by Step Solution

1. Step 1: Write the proportion equation
   86,078.90 : 129,122.69 = 61,047.47 : x
2. Step 2: Convert to fraction form
   86,078.90/129,122.69 = 61,047.47/x
3. Step 3: Cross multiply
   86,078.90x = 129,122.69 × 61,047.47
4. Step 4: Simplify right side
   86,078.90x = 7,882,613,561.66
5. Step 5: Solve for x
   x = 7,882,613,561.66/86,078.90
6. Step 6: Final answer
   x = 91,574.28