Finding the Fourth Proportional to 128,300.80, 177,047.96 and 70,936.76

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.80 : 177,047.96 = 70,936.76 : x
2. Step 2: Convert to fraction form
   128,300.80/177,047.96 = 70,936.76/x
3. Step 3: Cross multiply
   128,300.80x = 177,047.96 × 70,936.76
4. Step 4: Simplify right side
   128,300.80x = 12,559,208,647.01
5. Step 5: Solve for x
   x = 12,559,208,647.01/128,300.80
6. Step 6: Final answer
   x = 97,888.78