Finding the Fourth Proportional to 1,003.99, 1,506.89 and 840.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.99 : 1,506.89 = 840.48 : x
2. Step 2: Convert to fraction form
   1,003.99/1,506.89 = 840.48/x
3. Step 3: Cross multiply
   1,003.99x = 1,506.89 × 840.48
4. Step 4: Simplify right side
   1,003.99x = 1,266,510.47
5. Step 5: Solve for x
   x = 1,266,510.47/1,003.99
6. Step 6: Final answer
   x = 1,261.48