Finding the Fourth Proportional to 128,300.72, 177,047.84 and 70,936.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.72 : 177,047.84 = 70,936.72 : x
2. Step 2: Convert to fraction form
   128,300.72/177,047.84 = 70,936.72/x
3. Step 3: Cross multiply
   128,300.72x = 177,047.84 × 70,936.72
4. Step 4: Simplify right side
   128,300.72x = 12,559,193,052.68
5. Step 5: Solve for x
   x = 12,559,193,052.68/128,300.72
6. Step 6: Final answer
   x = 97,888.72