Finding the Fourth Proportional to 1,145.55, 1,578.51 and 947.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.55 : 1,578.51 = 947.10 : x
2. Step 2: Convert to fraction form
   1,145.55/1,578.51 = 947.10/x
3. Step 3: Cross multiply
   1,145.55x = 1,578.51 × 947.10
4. Step 4: Simplify right side
   1,145.55x = 1,495,006.82
5. Step 5: Solve for x
   x = 1,495,006.82/1,145.55
6. Step 6: Final answer
   x = 1,305.06