Finding the Fourth Proportional to 289,422.72, 399,294.72 and 170,190.72

Step by Step Solution

1. Step 1: Write the proportion equation
   289,422.72 : 399,294.72 = 170,190.72 : x
2. Step 2: Convert to fraction form
   289,422.72/399,294.72 = 170,190.72/x
3. Step 3: Cross multiply
   289,422.72x = 399,294.72 × 170,190.72
4. Step 4: Simplify right side
   289,422.72x = 67,956,255,889.00
5. Step 5: Solve for x
   x = 67,956,255,889.00/289,422.72
6. Step 6: Final answer
   x = 234,799.31