Finding the Fourth Proportional to 128,256.12, 176,993.01 and 71,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,256.12 : 176,993.01 = 71,667.50 : x
2. Step 2: Convert to fraction form
   128,256.12/176,993.01 = 71,667.50/x
3. Step 3: Cross multiply
   128,256.12x = 176,993.01 × 71,667.50
4. Step 4: Simplify right side
   128,256.12x = 12,684,645,659.21
5. Step 5: Solve for x
   x = 12,684,645,659.21/128,256.12
6. Step 6: Final answer
   x = 98,900.90