Finding the Fourth Proportional to 31,492.80, 42,865.20 and 31,492.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,492.80 : 42,865.20 = 31,492.80 : x
2. Step 2: Convert to fraction form
   31,492.80/42,865.20 = 31,492.80/x
3. Step 3: Cross multiply
   31,492.80x = 42,865.20 × 31,492.80
4. Step 4: Simplify right side
   31,492.80x = 1,349,945,170.56
5. Step 5: Solve for x
   x = 1,349,945,170.56/31,492.80
6. Step 6: Final answer
   x = 42,865.20