Finding the Fourth Proportional to 1,017.61, 1,404.30 and 551.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.61 : 1,404.30 = 551.86 : x
2. Step 2: Convert to fraction form
   1,017.61/1,404.30 = 551.86/x
3. Step 3: Cross multiply
   1,017.61x = 1,404.30 × 551.86
4. Step 4: Simplify right side
   1,017.61x = 774,969.98
5. Step 5: Solve for x
   x = 774,969.98/1,017.61
6. Step 6: Final answer
   x = 761.56