Finding the Fourth Proportional to 1,051.86, 1,451.04 and 698.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.86 : 1,451.04 = 698.40 : x
2. Step 2: Convert to fraction form
   1,051.86/1,451.04 = 698.40/x
3. Step 3: Cross multiply
   1,051.86x = 1,451.04 × 698.40
4. Step 4: Simplify right side
   1,051.86x = 1,013,406.34
5. Step 5: Solve for x
   x = 1,013,406.34/1,051.86
6. Step 6: Final answer
   x = 963.44