Finding the Fourth Proportional to 28,215.91, 42,314.82 and 9,490.87

Step by Step Solution

1. Step 1: Write the proportion equation
   28,215.91 : 42,314.82 = 9,490.87 : x
2. Step 2: Convert to fraction form
   28,215.91/42,314.82 = 9,490.87/x
3. Step 3: Cross multiply
   28,215.91x = 42,314.82 × 9,490.87
4. Step 4: Simplify right side
   28,215.91x = 401,604,455.69
5. Step 5: Solve for x
   x = 401,604,455.69/28,215.91
6. Step 6: Final answer
   x = 14,233.26