Finding the Fourth Proportional to 1,612.31, 2,225.10 and 904.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.31 : 2,225.10 = 904.15 : x
2. Step 2: Convert to fraction form
   1,612.31/2,225.10 = 904.15/x
3. Step 3: Cross multiply
   1,612.31x = 2,225.10 × 904.15
4. Step 4: Simplify right side
   1,612.31x = 2,011,818.60
5. Step 5: Solve for x
   x = 2,011,818.60/1,612.31
6. Step 6: Final answer
   x = 1,247.78