Finding the Fourth Proportional to 1,009.42, 1,392.12 and 635.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.42 : 1,392.12 = 635.98 : x
2. Step 2: Convert to fraction form
   1,009.42/1,392.12 = 635.98/x
3. Step 3: Cross multiply
   1,009.42x = 1,392.12 × 635.98
4. Step 4: Simplify right side
   1,009.42x = 885,360.48
5. Step 5: Solve for x
   x = 885,360.48/1,009.42
6. Step 6: Final answer
   x = 877.10