Finding the Fourth Proportional to 147,931.30, 221,751.15 and 72,990.10

Step by Step Solution

1. Step 1: Write the proportion equation
   147,931.30 : 221,751.15 = 72,990.10 : x
2. Step 2: Convert to fraction form
   147,931.30/221,751.15 = 72,990.10/x
3. Step 3: Cross multiply
   147,931.30x = 221,751.15 × 72,990.10
4. Step 4: Simplify right side
   147,931.30x = 16,185,638,613.62
5. Step 5: Solve for x
   x = 16,185,638,613.62/147,931.30
6. Step 6: Final answer
   x = 109,413.21