Finding the Fourth Proportional to 90,048.72, 124,151.76 and 61,705.20

Step by Step Solution

1. Step 1: Write the proportion equation
   90,048.72 : 124,151.76 = 61,705.20 : x
2. Step 2: Convert to fraction form
   90,048.72/124,151.76 = 61,705.20/x
3. Step 3: Cross multiply
   90,048.72x = 124,151.76 × 61,705.20
4. Step 4: Simplify right side
   90,048.72x = 7,660,809,181.15
5. Step 5: Solve for x
   x = 7,660,809,181.15/90,048.72
6. Step 6: Final answer
   x = 85,074.05