Finding the Fourth Proportional to 1,201.55, 1,658.12 and 670.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,201.55 : 1,658.12 = 670.43 : x
2. Step 2: Convert to fraction form
   1,201.55/1,658.12 = 670.43/x
3. Step 3: Cross multiply
   1,201.55x = 1,658.12 × 670.43
4. Step 4: Simplify right side
   1,201.55x = 1,111,641.75
5. Step 5: Solve for x
   x = 1,111,641.75/1,201.55
6. Step 6: Final answer
   x = 925.18