Finding the Fourth Proportional to 128,488.32, 192,382.56 and 99,926.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,488.32 : 192,382.56 = 99,926.10 : x
2. Step 2: Convert to fraction form
   128,488.32/192,382.56 = 99,926.10/x
3. Step 3: Cross multiply
   128,488.32x = 192,382.56 × 99,926.10
4. Step 4: Simplify right side
   128,488.32x = 19,224,038,928.82
5. Step 5: Solve for x
   x = 19,224,038,928.82/128,488.32
6. Step 6: Final answer
   x = 149,617.02