Finding the Fourth Proportional to 1,370.72, 2,054.74 and 875.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.72 : 2,054.74 = 875.61 : x
2. Step 2: Convert to fraction form
   1,370.72/2,054.74 = 875.61/x
3. Step 3: Cross multiply
   1,370.72x = 2,054.74 × 875.61
4. Step 4: Simplify right side
   1,370.72x = 1,799,150.89
5. Step 5: Solve for x
   x = 1,799,150.89/1,370.72
6. Step 6: Final answer
   x = 1,312.56