Finding the Fourth Proportional to 72,513.33, 99,840.99 and 65,870.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,513.33 : 99,840.99 = 65,870.28 : x
2. Step 2: Convert to fraction form
   72,513.33/99,840.99 = 65,870.28/x
3. Step 3: Cross multiply
   72,513.33x = 99,840.99 × 65,870.28
4. Step 4: Simplify right side
   72,513.33x = 6,576,553,966.78
5. Step 5: Solve for x
   x = 6,576,553,966.78/72,513.33
6. Step 6: Final answer
   x = 90,694.41