Finding the Fourth Proportional to 1,577.97, 2,178.27 and 988.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,577.97 : 2,178.27 = 988.38 : x
2. Step 2: Convert to fraction form
   1,577.97/2,178.27 = 988.38/x
3. Step 3: Cross multiply
   1,577.97x = 2,178.27 × 988.38
4. Step 4: Simplify right side
   1,577.97x = 2,152,958.50
5. Step 5: Solve for x
   x = 2,152,958.50/1,577.97
6. Step 6: Final answer
   x = 1,364.38