Finding the Fourth Proportional to 1,388.02, 1,915.56 and 798.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.02 : 1,915.56 = 798.70 : x
2. Step 2: Convert to fraction form
   1,388.02/1,915.56 = 798.70/x
3. Step 3: Cross multiply
   1,388.02x = 1,915.56 × 798.70
4. Step 4: Simplify right side
   1,388.02x = 1,529,957.77
5. Step 5: Solve for x
   x = 1,529,957.77/1,388.02
6. Step 6: Final answer
   x = 1,102.26