Finding the Fourth Proportional to 1,019.34, 1,528.10 and 988.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.34 : 1,528.10 = 988.36 : x
2. Step 2: Convert to fraction form
   1,019.34/1,528.10 = 988.36/x
3. Step 3: Cross multiply
   1,019.34x = 1,528.10 × 988.36
4. Step 4: Simplify right side
   1,019.34x = 1,510,307.86
5. Step 5: Solve for x
   x = 1,510,307.86/1,019.34
6. Step 6: Final answer
   x = 1,481.65