Finding the Fourth Proportional to 86,866, 130,078.47 and 72,789.01

Step by Step Solution

1. Step 1: Write the proportion equation
   86,866 : 130,078.47 = 72,789.01 : x
2. Step 2: Convert to fraction form
   86,866/130,078.47 = 72,789.01/x
3. Step 3: Cross multiply
   86,866x = 130,078.47 × 72,789.01
4. Step 4: Simplify right side
   86,866x = 9,468,283,053.61
5. Step 5: Solve for x
   x = 9,468,283,053.61/86,866
6. Step 6: Final answer
   x = 108,998.72