Finding the Fourth Proportional to 3,932.02, 5,426.20 and 2,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,932.02 : 5,426.20 = 2,139.50 : x
2. Step 2: Convert to fraction form
   3,932.02/5,426.20 = 2,139.50/x
3. Step 3: Cross multiply
   3,932.02x = 5,426.20 × 2,139.50
4. Step 4: Simplify right side
   3,932.02x = 11,609,322.42
5. Step 5: Solve for x
   x = 11,609,322.42/3,932.02
6. Step 6: Final answer
   x = 2,952.51