Finding the Fourth Proportional to 42,156.78, 63,238.80 and 10,992

Step by Step Solution

1. Step 1: Write the proportion equation
   42,156.78 : 63,238.80 = 10,992 : x
2. Step 2: Convert to fraction form
   42,156.78/63,238.80 = 10,992/x
3. Step 3: Cross multiply
   42,156.78x = 63,238.80 × 10,992
4. Step 4: Simplify right side
   42,156.78x = 695,120,889.60
5. Step 5: Solve for x
   x = 695,120,889.60/42,156.78
6. Step 6: Final answer
   x = 16,488.95