Finding the Fourth Proportional to 12,978.02, 19,467.06 and 3,618.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.02 : 19,467.06 = 3,618.06 : x
2. Step 2: Convert to fraction form
   12,978.02/19,467.06 = 3,618.06/x
3. Step 3: Cross multiply
   12,978.02x = 19,467.06 × 3,618.06
4. Step 4: Simplify right side
   12,978.02x = 70,432,991.10
5. Step 5: Solve for x
   x = 70,432,991.10/12,978.02
6. Step 6: Final answer
   x = 5,427.10