Finding the Fourth Proportional to 28,073.34, 42,123.12 and 12,276.31

Step by Step Solution

1. Step 1: Write the proportion equation
   28,073.34 : 42,123.12 = 12,276.31 : x
2. Step 2: Convert to fraction form
   28,073.34/42,123.12 = 12,276.31/x
3. Step 3: Cross multiply
   28,073.34x = 42,123.12 × 12,276.31
4. Step 4: Simplify right side
   28,073.34x = 517,116,479.29
5. Step 5: Solve for x
   x = 517,116,479.29/28,073.34
6. Step 6: Final answer
   x = 18,420.20