Finding the Fourth Proportional to 128,300.75, 177,047.90 and 70,936.74

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.75 : 177,047.90 = 70,936.74 : x
2. Step 2: Convert to fraction form
   128,300.75/177,047.90 = 70,936.74/x
3. Step 3: Cross multiply
   128,300.75x = 177,047.90 × 70,936.74
4. Step 4: Simplify right side
   128,300.75x = 12,559,200,849.85
5. Step 5: Solve for x
   x = 12,559,200,849.85/128,300.75
6. Step 6: Final answer
   x = 97,888.76