Finding the Fourth Proportional to 2,656.73, 3,985.23 and 807.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.73 : 3,985.23 = 807.90 : x
2. Step 2: Convert to fraction form
   2,656.73/3,985.23 = 807.90/x
3. Step 3: Cross multiply
   2,656.73x = 3,985.23 × 807.90
4. Step 4: Simplify right side
   2,656.73x = 3,219,667.32
5. Step 5: Solve for x
   x = 3,219,667.32/2,656.73
6. Step 6: Final answer
   x = 1,211.89