Finding the Fourth Proportional to 56,215.50, 77,577.60 and 31,065

Step by Step Solution

1. Step 1: Write the proportion equation
   56,215.50 : 77,577.60 = 31,065 : x
2. Step 2: Convert to fraction form
   56,215.50/77,577.60 = 31,065/x
3. Step 3: Cross multiply
   56,215.50x = 77,577.60 × 31,065
4. Step 4: Simplify right side
   56,215.50x = 2,409,948,144
5. Step 5: Solve for x
   x = 2,409,948,144/56,215.50
6. Step 6: Final answer
   x = 42,869.82