Finding the Fourth Proportional to 28,123.10, 42,191.05 and 16,430.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,123.10 : 42,191.05 = 16,430.30 : x
2. Step 2: Convert to fraction form
   28,123.10/42,191.05 = 16,430.30/x
3. Step 3: Cross multiply
   28,123.10x = 42,191.05 × 16,430.30
4. Step 4: Simplify right side
   28,123.10x = 693,211,608.82
5. Step 5: Solve for x
   x = 693,211,608.82/28,123.10
6. Step 6: Final answer
   x = 24,649.19