Finding the Fourth Proportional to 56,839.89, 78,439.20 and 31,345.62

Step by Step Solution

1. Step 1: Write the proportion equation
   56,839.89 : 78,439.20 = 31,345.62 : x
2. Step 2: Convert to fraction form
   56,839.89/78,439.20 = 31,345.62/x
3. Step 3: Cross multiply
   56,839.89x = 78,439.20 × 31,345.62
4. Step 4: Simplify right side
   56,839.89x = 2,458,725,356.30
5. Step 5: Solve for x
   x = 2,458,725,356.30/56,839.89
6. Step 6: Final answer
   x = 43,257.04