Finding the Fourth Proportional to 128,643.34, 177,527.81 and 78,342.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128,643.34 : 177,527.81 = 78,342.34 : x
2. Step 2: Convert to fraction form
   128,643.34/177,527.81 = 78,342.34/x
3. Step 3: Cross multiply
   128,643.34x = 177,527.81 × 78,342.34
4. Step 4: Simplify right side
   128,643.34x = 13,907,944,050.48
5. Step 5: Solve for x
   x = 13,907,944,050.48/128,643.34
6. Step 6: Final answer
   x = 108,112.43