Finding the Fourth Proportional to 12,090.64, 18,139.47 and 4,300.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,090.64 : 18,139.47 = 4,300.06 : x
2. Step 2: Convert to fraction form
   12,090.64/18,139.47 = 4,300.06/x
3. Step 3: Cross multiply
   12,090.64x = 18,139.47 × 4,300.06
4. Step 4: Simplify right side
   12,090.64x = 78,000,809.37
5. Step 5: Solve for x
   x = 78,000,809.37/12,090.64
6. Step 6: Final answer
   x = 6,451.34