Finding the Fourth Proportional to 289,380.72, 434,139.30 and 120,807.30

Step by Step Solution

1. Step 1: Write the proportion equation
   289,380.72 : 434,139.30 = 120,807.30 : x
2. Step 2: Convert to fraction form
   289,380.72/434,139.30 = 120,807.30/x
3. Step 3: Cross multiply
   289,380.72x = 434,139.30 × 120,807.30
4. Step 4: Simplify right side
   289,380.72x = 52,447,196,656.89
5. Step 5: Solve for x
   x = 52,447,196,656.89/289,380.72
6. Step 6: Final answer
   x = 181,239.43