Finding the Fourth Proportional to 1,507.30, 2,080.18 and 877.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.30 : 2,080.18 = 877.98 : x
2. Step 2: Convert to fraction form
   1,507.30/2,080.18 = 877.98/x
3. Step 3: Cross multiply
   1,507.30x = 2,080.18 × 877.98
4. Step 4: Simplify right side
   1,507.30x = 1,826,356.44
5. Step 5: Solve for x
   x = 1,826,356.44/1,507.30
6. Step 6: Final answer
   x = 1,211.67