Finding the Fourth Proportional to 2,128.72, 2,937.60 and 1,197.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.72 : 2,937.60 = 1,197.22 : x
2. Step 2: Convert to fraction form
   2,128.72/2,937.60 = 1,197.22/x
3. Step 3: Cross multiply
   2,128.72x = 2,937.60 × 1,197.22
4. Step 4: Simplify right side
   2,128.72x = 3,516,953.47
5. Step 5: Solve for x
   x = 3,516,953.47/2,128.72
6. Step 6: Final answer
   x = 1,652.14