Finding the Fourth Proportional to 38,124.61, 52,614.06 and 21,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   38,124.61 : 52,614.06 = 21,128.50 : x
2. Step 2: Convert to fraction form
   38,124.61/52,614.06 = 21,128.50/x
3. Step 3: Cross multiply
   38,124.61x = 52,614.06 × 21,128.50
4. Step 4: Simplify right side
   38,124.61x = 1,111,656,166.71
5. Step 5: Solve for x
   x = 1,111,656,166.71/38,124.61
6. Step 6: Final answer
   x = 29,158.49