Finding the Fourth Proportional to 1,345.02, 2,018.31 and 768.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.02 : 2,018.31 = 768.30 : x
2. Step 2: Convert to fraction form
   1,345.02/2,018.31 = 768.30/x
3. Step 3: Cross multiply
   1,345.02x = 2,018.31 × 768.30
4. Step 4: Simplify right side
   1,345.02x = 1,550,667.57
5. Step 5: Solve for x
   x = 1,550,667.57/1,345.02
6. Step 6: Final answer
   x = 1,152.90