Finding the Fourth Proportional to 28,111.94, 42,174.31 and 9,642.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.94 : 42,174.31 = 9,642.82 : x
2. Step 2: Convert to fraction form
   28,111.94/42,174.31 = 9,642.82/x
3. Step 3: Cross multiply
   28,111.94x = 42,174.31 × 9,642.82
4. Step 4: Simplify right side
   28,111.94x = 406,679,279.95
5. Step 5: Solve for x
   x = 406,679,279.95/28,111.94
6. Step 6: Final answer
   x = 14,466.43