Finding the Fourth Proportional to 31,238.32, 43,124.52 and 21,219.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,238.32 : 43,124.52 = 21,219.76 : x
2. Step 2: Convert to fraction form
   31,238.32/43,124.52 = 21,219.76/x
3. Step 3: Cross multiply
   31,238.32x = 43,124.52 × 21,219.76
4. Step 4: Simplify right side
   31,238.32x = 915,091,964.52
5. Step 5: Solve for x
   x = 915,091,964.52/31,238.32
6. Step 6: Final answer
   x = 29,293.89