Finding the Fourth Proportional to 56,616.18, 78,128.16 and 31,467.30

Step by Step Solution

1. Step 1: Write the proportion equation
   56,616.18 : 78,128.16 = 31,467.30 : x
2. Step 2: Convert to fraction form
   56,616.18/78,128.16 = 31,467.30/x
3. Step 3: Cross multiply
   56,616.18x = 78,128.16 × 31,467.30
4. Step 4: Simplify right side
   56,616.18x = 2,458,482,249.17
5. Step 5: Solve for x
   x = 2,458,482,249.17/56,616.18
6. Step 6: Final answer
   x = 43,423.67