Finding the Fourth Proportional to 128,273, 177,017.86 and 70,911.42

Step by Step Solution

1. Step 1: Write the proportion equation
   128,273 : 177,017.86 = 70,911.42 : x
2. Step 2: Convert to fraction form
   128,273/177,017.86 = 70,911.42/x
3. Step 3: Cross multiply
   128,273x = 177,017.86 × 70,911.42
4. Step 4: Simplify right side
   128,273x = 12,552,587,817.96
5. Step 5: Solve for x
   x = 12,552,587,817.96/128,273
6. Step 6: Final answer
   x = 97,858.38