Finding the Fourth Proportional to 56,439.89, 77,890.56 and 31,289.39

Step by Step Solution

1. Step 1: Write the proportion equation
   56,439.89 : 77,890.56 = 31,289.39 : x
2. Step 2: Convert to fraction form
   56,439.89/77,890.56 = 31,289.39/x
3. Step 3: Cross multiply
   56,439.89x = 77,890.56 × 31,289.39
4. Step 4: Simplify right side
   56,439.89x = 2,437,148,332.59
5. Step 5: Solve for x
   x = 2,437,148,332.59/56,439.89
6. Step 6: Final answer
   x = 43,181.31