Finding the Fourth Proportional to 56,661, 78,192.18 and 31,510.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,661 : 78,192.18 = 31,510.50 : x
2. Step 2: Convert to fraction form
   56,661/78,192.18 = 31,510.50/x
3. Step 3: Cross multiply
   56,661x = 78,192.18 × 31,510.50
4. Step 4: Simplify right side
   56,661x = 2,463,874,687.89
5. Step 5: Solve for x
   x = 2,463,874,687.89/56,661
6. Step 6: Final answer
   x = 43,484.49