Finding the Fourth Proportional to 2,245.21, 3,100.30 and 1,407.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,245.21 : 3,100.30 = 1,407.31 : x
2. Step 2: Convert to fraction form
   2,245.21/3,100.30 = 1,407.31/x
3. Step 3: Cross multiply
   2,245.21x = 3,100.30 × 1,407.31
4. Step 4: Simplify right side
   2,245.21x = 4,363,088.96
5. Step 5: Solve for x
   x = 4,363,088.96/2,245.21
6. Step 6: Final answer
   x = 1,943.29