Finding the Fourth Proportional to 28,299.98, 42,429.84 and 13,298.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,299.98 : 42,429.84 = 13,298.72 : x
2. Step 2: Convert to fraction form
   28,299.98/42,429.84 = 13,298.72/x
3. Step 3: Cross multiply
   28,299.98x = 42,429.84 × 13,298.72
4. Step 4: Simplify right side
   28,299.98x = 564,262,561.80
5. Step 5: Solve for x
   x = 564,262,561.80/28,299.98
6. Step 6: Final answer
   x = 19,938.62