Finding the Fourth Proportional to 1,300.42, 1,941.13 and 1,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.42 : 1,941.13 = 1,128.30 : x
2. Step 2: Convert to fraction form
   1,300.42/1,941.13 = 1,128.30/x
3. Step 3: Cross multiply
   1,300.42x = 1,941.13 × 1,128.30
4. Step 4: Simplify right side
   1,300.42x = 2,190,176.98
5. Step 5: Solve for x
   x = 2,190,176.98/1,300.42
6. Step 6: Final answer
   x = 1,684.21