Finding the Fourth Proportional to 56,644.32, 78,162.28 and 31,146.48

Step by Step Solution

1. Step 1: Write the proportion equation
   56,644.32 : 78,162.28 = 31,146.48 : x
2. Step 2: Convert to fraction form
   56,644.32/78,162.28 = 31,146.48/x
3. Step 3: Cross multiply
   56,644.32x = 78,162.28 × 31,146.48
4. Step 4: Simplify right side
   56,644.32x = 2,434,479,890.77
5. Step 5: Solve for x
   x = 2,434,479,890.77/56,644.32
6. Step 6: Final answer
   x = 42,978.36