Finding the Fourth Proportional to 42,406.78, 63,822.91 and 31,931.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,406.78 : 63,822.91 = 31,931.08 : x
2. Step 2: Convert to fraction form
   42,406.78/63,822.91 = 31,931.08/x
3. Step 3: Cross multiply
   42,406.78x = 63,822.91 × 31,931.08
4. Step 4: Simplify right side
   42,406.78x = 2,037,934,445.04
5. Step 5: Solve for x
   x = 2,037,934,445.04/42,406.78
6. Step 6: Final answer
   x = 48,056.81