Finding the Fourth Proportional to 1,071.77, 1,478.52 and 698.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.77 : 1,478.52 = 698.58 : x
2. Step 2: Convert to fraction form
   1,071.77/1,478.52 = 698.58/x
3. Step 3: Cross multiply
   1,071.77x = 1,478.52 × 698.58
4. Step 4: Simplify right side
   1,071.77x = 1,032,864.50
5. Step 5: Solve for x
   x = 1,032,864.50/1,071.77
6. Step 6: Final answer
   x = 963.70