Finding the Fourth Proportional to 1,188.84, 1,641.78 and 1,013.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188.84 : 1,641.78 = 1,013.16 : x
2. Step 2: Convert to fraction form
   1,188.84/1,641.78 = 1,013.16/x
3. Step 3: Cross multiply
   1,188.84x = 1,641.78 × 1,013.16
4. Step 4: Simplify right side
   1,188.84x = 1,663,385.82
5. Step 5: Solve for x
   x = 1,663,385.82/1,188.84
6. Step 6: Final answer
   x = 1,399.17