Finding the Fourth Proportional to 1,507.07, 2,079.59 and 877.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.07 : 2,079.59 = 877.61 : x
2. Step 2: Convert to fraction form
   1,507.07/2,079.59 = 877.61/x
3. Step 3: Cross multiply
   1,507.07x = 2,079.59 × 877.61
4. Step 4: Simplify right side
   1,507.07x = 1,825,054.19
5. Step 5: Solve for x
   x = 1,825,054.19/1,507.07
6. Step 6: Final answer
   x = 1,211.00