Finding the Fourth Proportional to 1,368.78, 1,888.56 and 1,018.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.78 : 1,888.56 = 1,018.86 : x
2. Step 2: Convert to fraction form
   1,368.78/1,888.56 = 1,018.86/x
3. Step 3: Cross multiply
   1,368.78x = 1,888.56 × 1,018.86
4. Step 4: Simplify right side
   1,368.78x = 1,924,178.24
5. Step 5: Solve for x
   x = 1,924,178.24/1,368.78
6. Step 6: Final answer
   x = 1,405.76