Finding the Fourth Proportional to 31,095.72, 42,901.38 and 21,660.84

Step by Step Solution

1. Step 1: Write the proportion equation
   31,095.72 : 42,901.38 = 21,660.84 : x
2. Step 2: Convert to fraction form
   31,095.72/42,901.38 = 21,660.84/x
3. Step 3: Cross multiply
   31,095.72x = 42,901.38 × 21,660.84
4. Step 4: Simplify right side
   31,095.72x = 929,279,927.96
5. Step 5: Solve for x
   x = 929,279,927.96/31,095.72
6. Step 6: Final answer
   x = 29,884.50