Finding the Fourth Proportional to 128,298.72, 192,427.86 and 42,908.93

Step by Step Solution

1. Step 1: Write the proportion equation
   128,298.72 : 192,427.86 = 42,908.93 : x
2. Step 2: Convert to fraction form
   128,298.72/192,427.86 = 42,908.93/x
3. Step 3: Cross multiply
   128,298.72x = 192,427.86 × 42,908.93
4. Step 4: Simplify right side
   128,298.72x = 8,256,872,612.65
5. Step 5: Solve for x
   x = 8,256,872,612.65/128,298.72
6. Step 6: Final answer
   x = 64,356.63