Finding the Fourth Proportional to 56,815.32, 78,407.82 and 31,665

Step by Step Solution

1. Step 1: Write the proportion equation
   56,815.32 : 78,407.82 = 31,665 : x
2. Step 2: Convert to fraction form
   56,815.32/78,407.82 = 31,665/x
3. Step 3: Cross multiply
   56,815.32x = 78,407.82 × 31,665
4. Step 4: Simplify right side
   56,815.32x = 2,482,783,620.30
5. Step 5: Solve for x
   x = 2,482,783,620.30/56,815.32
6. Step 6: Final answer
   x = 43,699.19