Finding the Fourth Proportional to 200,167.72, 276,101.22 and 128,434.12

Step by Step Solution

1. Step 1: Write the proportion equation
   200,167.72 : 276,101.22 = 128,434.12 : x
2. Step 2: Convert to fraction form
   200,167.72/276,101.22 = 128,434.12/x
3. Step 3: Cross multiply
   200,167.72x = 276,101.22 × 128,434.12
4. Step 4: Simplify right side
   200,167.72x = 35,460,817,221.63
5. Step 5: Solve for x
   x = 35,460,817,221.63/200,167.72
6. Step 6: Final answer
   x = 177,155.52