Finding the Fourth Proportional to 1,338.24, 1,846.50 and 840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.24 : 1,846.50 = 840.72 : x
2. Step 2: Convert to fraction form
   1,338.24/1,846.50 = 840.72/x
3. Step 3: Cross multiply
   1,338.24x = 1,846.50 × 840.72
4. Step 4: Simplify right side
   1,338.24x = 1,552,389.48
5. Step 5: Solve for x
   x = 1,552,389.48/1,338.24
6. Step 6: Final answer
   x = 1,160.02