Finding the Fourth Proportional to 109,720.90, 164,566.76 and 43,143.15

Step by Step Solution

1. Step 1: Write the proportion equation
   109,720.90 : 164,566.76 = 43,143.15 : x
2. Step 2: Convert to fraction form
   109,720.90/164,566.76 = 43,143.15/x
3. Step 3: Cross multiply
   109,720.90x = 164,566.76 × 43,143.15
4. Step 4: Simplify right side
   109,720.90x = 7,099,928,411.69
5. Step 5: Solve for x
   x = 7,099,928,411.69/109,720.90
6. Step 6: Final answer
   x = 64,708.99