Finding the Fourth Proportional to 1,117.06, 1,541.61 and 619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117.06 : 1,541.61 = 619.72 : x
2. Step 2: Convert to fraction form
   1,117.06/1,541.61 = 619.72/x
3. Step 3: Cross multiply
   1,117.06x = 1,541.61 × 619.72
4. Step 4: Simplify right side
   1,117.06x = 955,366.55
5. Step 5: Solve for x
   x = 955,366.55/1,117.06
6. Step 6: Final answer
   x = 855.25