Finding the Fourth Proportional to 38,501.43, 53,128.52 and 21,503.31

Step by Step Solution

1. Step 1: Write the proportion equation
   38,501.43 : 53,128.52 = 21,503.31 : x
2. Step 2: Convert to fraction form
   38,501.43/53,128.52 = 21,503.31/x
3. Step 3: Cross multiply
   38,501.43x = 53,128.52 × 21,503.31
4. Step 4: Simplify right side
   38,501.43x = 1,142,438,927.88
5. Step 5: Solve for x
   x = 1,142,438,927.88/38,501.43
6. Step 6: Final answer
   x = 29,672.64