Finding the Fourth Proportional to 56,287.89, 77,679.69 and 31,137.39

Step by Step Solution

1. Step 1: Write the proportion equation
   56,287.89 : 77,679.69 = 31,137.39 : x
2. Step 2: Convert to fraction form
   56,287.89/77,679.69 = 31,137.39/x
3. Step 3: Cross multiply
   56,287.89x = 77,679.69 × 31,137.39
4. Step 4: Simplify right side
   56,287.89x = 2,418,742,802.61
5. Step 5: Solve for x
   x = 2,418,742,802.61/56,287.89
6. Step 6: Final answer
   x = 42,970.93