Finding the Fourth Proportional to 28,123.05, 42,196.22 and 12,319.92

Step by Step Solution

1. Step 1: Write the proportion equation
   28,123.05 : 42,196.22 = 12,319.92 : x
2. Step 2: Convert to fraction form
   28,123.05/42,196.22 = 12,319.92/x
3. Step 3: Cross multiply
   28,123.05x = 42,196.22 × 12,319.92
4. Step 4: Simplify right side
   28,123.05x = 519,854,054.70
5. Step 5: Solve for x
   x = 519,854,054.70/28,123.05
6. Step 6: Final answer
   x = 18,484.98