Finding the Fourth Proportional to 128,424.32, 177,238.80 and 73,978.32

Step by Step Solution

1. Step 1: Write the proportion equation
   128,424.32 : 177,238.80 = 73,978.32 : x
2. Step 2: Convert to fraction form
   128,424.32/177,238.80 = 73,978.32/x
3. Step 3: Cross multiply
   128,424.32x = 177,238.80 × 73,978.32
4. Step 4: Simplify right side
   128,424.32x = 13,111,828,662.82
5. Step 5: Solve for x
   x = 13,111,828,662.82/128,424.32
6. Step 6: Final answer
   x = 102,097.71