Finding the Fourth Proportional to 1,615.98, 2,230.08 and 907.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.98 : 2,230.08 = 907.86 : x
2. Step 2: Convert to fraction form
   1,615.98/2,230.08 = 907.86/x
3. Step 3: Cross multiply
   1,615.98x = 2,230.08 × 907.86
4. Step 4: Simplify right side
   1,615.98x = 2,024,600.43
5. Step 5: Solve for x
   x = 2,024,600.43/1,615.98
6. Step 6: Final answer
   x = 1,252.86