Finding the Fourth Proportional to 1,681.83, 2,518.83 and 987.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.83 : 2,518.83 = 987.12 : x
2. Step 2: Convert to fraction form
   1,681.83/2,518.83 = 987.12/x
3. Step 3: Cross multiply
   1,681.83x = 2,518.83 × 987.12
4. Step 4: Simplify right side
   1,681.83x = 2,486,387.47
5. Step 5: Solve for x
   x = 2,486,387.47/1,681.83
6. Step 6: Final answer
   x = 1,478.38