Finding the Fourth Proportional to 52,640.72, 72,620.86 and 31,407.64

Step by Step Solution

1. Step 1: Write the proportion equation
   52,640.72 : 72,620.86 = 31,407.64 : x
2. Step 2: Convert to fraction form
   52,640.72/72,620.86 = 31,407.64/x
3. Step 3: Cross multiply
   52,640.72x = 72,620.86 × 31,407.64
4. Step 4: Simplify right side
   52,640.72x = 2,280,849,827.37
5. Step 5: Solve for x
   x = 2,280,849,827.37/52,640.72
6. Step 6: Final answer
   x = 43,328.62