Finding the Fourth Proportional to 28,471.50, 42,662.70 and 21,443.40

Step by Step Solution

1. Step 1: Write the proportion equation
   28,471.50 : 42,662.70 = 21,443.40 : x
2. Step 2: Convert to fraction form
   28,471.50/42,662.70 = 21,443.40/x
3. Step 3: Cross multiply
   28,471.50x = 42,662.70 × 21,443.40
4. Step 4: Simplify right side
   28,471.50x = 914,833,341.18
5. Step 5: Solve for x
   x = 914,833,341.18/28,471.50
6. Step 6: Final answer
   x = 32,131.55