Finding the Fourth Proportional to 128,300.78, 177,047.93 and 70,936.78

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.78 : 177,047.93 = 70,936.78 : x
2. Step 2: Convert to fraction form
   128,300.78/177,047.93 = 70,936.78/x
3. Step 3: Cross multiply
   128,300.78x = 177,047.93 × 70,936.78
4. Step 4: Simplify right side
   128,300.78x = 12,559,210,059.87
5. Step 5: Solve for x
   x = 12,559,210,059.87/128,300.78
6. Step 6: Final answer
   x = 97,888.81