Finding the Fourth Proportional to 5,145.32, 7,100.52 and 2,787.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.32 : 7,100.52 = 2,787.40 : x
2. Step 2: Convert to fraction form
   5,145.32/7,100.52 = 2,787.40/x
3. Step 3: Cross multiply
   5,145.32x = 7,100.52 × 2,787.40
4. Step 4: Simplify right side
   5,145.32x = 19,791,989.45
5. Step 5: Solve for x
   x = 19,791,989.45/5,145.32
6. Step 6: Final answer
   x = 3,846.60