Finding the Fourth Proportional to 1,693.22, 2,336.72 and 947.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,693.22 : 2,336.72 = 947.16 : x
2. Step 2: Convert to fraction form
   1,693.22/2,336.72 = 947.16/x
3. Step 3: Cross multiply
   1,693.22x = 2,336.72 × 947.16
4. Step 4: Simplify right side
   1,693.22x = 2,213,242.98
5. Step 5: Solve for x
   x = 2,213,242.98/1,693.22
6. Step 6: Final answer
   x = 1,307.12