Finding the Fourth Proportional to 31,143.72, 46,715.76 and 7,770.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,143.72 : 46,715.76 = 7,770.18 : x
2. Step 2: Convert to fraction form
   31,143.72/46,715.76 = 7,770.18/x
3. Step 3: Cross multiply
   31,143.72x = 46,715.76 × 7,770.18
4. Step 4: Simplify right side
   31,143.72x = 362,989,864.04
5. Step 5: Solve for x
   x = 362,989,864.04/31,143.72
6. Step 6: Final answer
   x = 11,655.31