Finding the Fourth Proportional to 72,878.13, 99,915.83 and 71,549.53

Step by Step Solution

1. Step 1: Write the proportion equation
   72,878.13 : 99,915.83 = 71,549.53 : x
2. Step 2: Convert to fraction form
   72,878.13/99,915.83 = 71,549.53/x
3. Step 3: Cross multiply
   72,878.13x = 99,915.83 × 71,549.53
4. Step 4: Simplify right side
   72,878.13x = 7,148,930,336.83
5. Step 5: Solve for x
   x = 7,148,930,336.83/72,878.13
6. Step 6: Final answer
   x = 98,094.32