Finding the Fourth Proportional to 56,243.12, 77,612.46 and 31,091

Step by Step Solution

1. Step 1: Write the proportion equation
   56,243.12 : 77,612.46 = 31,091 : x
2. Step 2: Convert to fraction form
   56,243.12/77,612.46 = 31,091/x
3. Step 3: Cross multiply
   56,243.12x = 77,612.46 × 31,091
4. Step 4: Simplify right side
   56,243.12x = 2,413,048,993.86
5. Step 5: Solve for x
   x = 2,413,048,993.86/56,243.12
6. Step 6: Final answer
   x = 42,903.90