Finding the Fourth Proportional to 56,311.56, 77,710.50 and 31,161

Step by Step Solution

1. Step 1: Write the proportion equation
   56,311.56 : 77,710.50 = 31,161 : x
2. Step 2: Convert to fraction form
   56,311.56/77,710.50 = 31,161/x
3. Step 3: Cross multiply
   56,311.56x = 77,710.50 × 31,161
4. Step 4: Simplify right side
   56,311.56x = 2,421,536,890.50
5. Step 5: Solve for x
   x = 2,421,536,890.50/56,311.56
6. Step 6: Final answer
   x = 43,002.48