Finding the Fourth Proportional to 2,312.20, 3,123.90 and 2,312.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.20 : 3,123.90 = 2,312.20 : x
2. Step 2: Convert to fraction form
   2,312.20/3,123.90 = 2,312.20/x
3. Step 3: Cross multiply
   2,312.20x = 3,123.90 × 2,312.20
4. Step 4: Simplify right side
   2,312.20x = 7,223,081.58
5. Step 5: Solve for x
   x = 7,223,081.58/2,312.20
6. Step 6: Final answer
   x = 3,123.90