Finding the Fourth Proportional to 1,007.56, 1,510.06 and 545.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.56 : 1,510.06 = 545.72 : x
2. Step 2: Convert to fraction form
   1,007.56/1,510.06 = 545.72/x
3. Step 3: Cross multiply
   1,007.56x = 1,510.06 × 545.72
4. Step 4: Simplify right side
   1,007.56x = 824,074.61
5. Step 5: Solve for x
   x = 824,074.61/1,007.56
6. Step 6: Final answer
   x = 817.89