Finding the Fourth Proportional to 42,146.90, 63,218.89 and 10,557.23

Step by Step Solution

1. Step 1: Write the proportion equation
   42,146.90 : 63,218.89 = 10,557.23 : x
2. Step 2: Convert to fraction form
   42,146.90/63,218.89 = 10,557.23/x
3. Step 3: Cross multiply
   42,146.90x = 63,218.89 × 10,557.23
4. Step 4: Simplify right side
   42,146.90x = 667,416,326.72
5. Step 5: Solve for x
   x = 667,416,326.72/42,146.90
6. Step 6: Final answer
   x = 15,835.48