Finding the Fourth Proportional to 2,507.61, 3,460.63 and 1,388.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.61 : 3,460.63 = 1,388.67 : x
2. Step 2: Convert to fraction form
   2,507.61/3,460.63 = 1,388.67/x
3. Step 3: Cross multiply
   2,507.61x = 3,460.63 × 1,388.67
4. Step 4: Simplify right side
   2,507.61x = 4,805,648.82
5. Step 5: Solve for x
   x = 4,805,648.82/2,507.61
6. Step 6: Final answer
   x = 1,916.43