Finding the Fourth Proportional to 128,200,559.62, 176,977,771.74 and 85,886,978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   128,200,559.62 : 176,977,771.74 = 85,886,978.05 : x
2. Step 2: Convert to fraction form
   128,200,559.62/176,977,771.74 = 85,886,978.05/x
3. Step 3: Cross multiply
   128,200,559.62x = 176,977,771.74 × 85,886,978.05
4. Step 4: Simplify right side
   128,200,559.62x = 15,200,085,996,771,290
5. Step 5: Solve for x
   x = 15,200,085,996,771,290/128,200,559.62
6. Step 6: Final answer
   x = 118,564,895.83