Finding the Fourth Proportional to 1,773.60, 2,447.46 and 987.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,773.60 : 2,447.46 = 987.60 : x
2. Step 2: Convert to fraction form
   1,773.60/2,447.46 = 987.60/x
3. Step 3: Cross multiply
   1,773.60x = 2,447.46 × 987.60
4. Step 4: Simplify right side
   1,773.60x = 2,417,111.50
5. Step 5: Solve for x
   x = 2,417,111.50/1,773.60
6. Step 6: Final answer
   x = 1,362.83