Finding the Fourth Proportional to 30,532.31, 42,113.55 and 21,476.88

Step by Step Solution

1. Step 1: Write the proportion equation
   30,532.31 : 42,113.55 = 21,476.88 : x
2. Step 2: Convert to fraction form
   30,532.31/42,113.55 = 21,476.88/x
3. Step 3: Cross multiply
   30,532.31x = 42,113.55 × 21,476.88
4. Step 4: Simplify right side
   30,532.31x = 904,467,659.72
5. Step 5: Solve for x
   x = 904,467,659.72/30,532.31
6. Step 6: Final answer
   x = 29,623.30