Finding the Fourth Proportional to 1,237.98, 1,856.61 and 807.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,237.98 : 1,856.61 = 807.42 : x
2. Step 2: Convert to fraction form
   1,237.98/1,856.61 = 807.42/x
3. Step 3: Cross multiply
   1,237.98x = 1,856.61 × 807.42
4. Step 4: Simplify right side
   1,237.98x = 1,499,064.05
5. Step 5: Solve for x
   x = 1,499,064.05/1,237.98
6. Step 6: Final answer
   x = 1,210.90