Finding the Fourth Proportional to 28,123.30, 42,201.15 and 10,605.70

Step by Step Solution

1. Step 1: Write the proportion equation
   28,123.30 : 42,201.15 = 10,605.70 : x
2. Step 2: Convert to fraction form
   28,123.30/42,201.15 = 10,605.70/x
3. Step 3: Cross multiply
   28,123.30x = 42,201.15 × 10,605.70
4. Step 4: Simplify right side
   28,123.30x = 447,572,736.56
5. Step 5: Solve for x
   x = 447,572,736.56/28,123.30
6. Step 6: Final answer
   x = 15,914.66