Finding the Fourth Proportional to 21,931.74, 32,902.16 and 7,139.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,931.74 : 32,902.16 = 7,139.42 : x
2. Step 2: Convert to fraction form
   21,931.74/32,902.16 = 7,139.42/x
3. Step 3: Cross multiply
   21,931.74x = 32,902.16 × 7,139.42
4. Step 4: Simplify right side
   21,931.74x = 234,902,339.15
5. Step 5: Solve for x
   x = 234,902,339.15/21,931.74
6. Step 6: Final answer
   x = 10,710.61