Finding the Fourth Proportional to 1,407.80, 1,941.90 and 1,242.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.80 : 1,941.90 = 1,242.38 : x
2. Step 2: Convert to fraction form
   1,407.80/1,941.90 = 1,242.38/x
3. Step 3: Cross multiply
   1,407.80x = 1,941.90 × 1,242.38
4. Step 4: Simplify right side
   1,407.80x = 2,412,577.72
5. Step 5: Solve for x
   x = 2,412,577.72/1,407.80
6. Step 6: Final answer
   x = 1,713.72