Finding the Fourth Proportional to 28,216.61, 42,311.65 and 10,434.98

Step by Step Solution

1. Step 1: Write the proportion equation
   28,216.61 : 42,311.65 = 10,434.98 : x
2. Step 2: Convert to fraction form
   28,216.61/42,311.65 = 10,434.98/x
3. Step 3: Cross multiply
   28,216.61x = 42,311.65 × 10,434.98
4. Step 4: Simplify right side
   28,216.61x = 441,521,221.52
5. Step 5: Solve for x
   x = 441,521,221.52/28,216.61
6. Step 6: Final answer
   x = 15,647.56