Finding the Fourth Proportional to 1,445.16, 1,993.57 and 947.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.16 : 1,993.57 = 947.55 : x
2. Step 2: Convert to fraction form
   1,445.16/1,993.57 = 947.55/x
3. Step 3: Cross multiply
   1,445.16x = 1,993.57 × 947.55
4. Step 4: Simplify right side
   1,445.16x = 1,889,004.88
5. Step 5: Solve for x
   x = 1,889,004.88/1,445.16
6. Step 6: Final answer
   x = 1,307.13