Finding the Fourth Proportional to 71,521.56, 98,703.12 and 39,690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,521.56 : 98,703.12 = 39,690.72 : x
2. Step 2: Convert to fraction form
   71,521.56/98,703.12 = 39,690.72/x
3. Step 3: Cross multiply
   71,521.56x = 98,703.12 × 39,690.72
4. Step 4: Simplify right side
   71,521.56x = 3,917,597,899.05
5. Step 5: Solve for x
   x = 3,917,597,899.05/71,521.56
6. Step 6: Final answer
   x = 54,775.06