Finding the Fourth Proportional to 31,095.34, 42,877.69 and 21,006.27

Step by Step Solution

1. Step 1: Write the proportion equation
   31,095.34 : 42,877.69 = 21,006.27 : x
2. Step 2: Convert to fraction form
   31,095.34/42,877.69 = 21,006.27/x
3. Step 3: Cross multiply
   31,095.34x = 42,877.69 × 21,006.27
4. Step 4: Simplify right side
   31,095.34x = 900,700,280.60
5. Step 5: Solve for x
   x = 900,700,280.60/31,095.34
6. Step 6: Final answer
   x = 28,965.77