Finding the Fourth Proportional to 85,503.60, 128,273.10 and 42,830.94

Step by Step Solution

1. Step 1: Write the proportion equation
   85,503.60 : 128,273.10 = 42,830.94 : x
2. Step 2: Convert to fraction form
   85,503.60/128,273.10 = 42,830.94/x
3. Step 3: Cross multiply
   85,503.60x = 128,273.10 × 42,830.94
4. Step 4: Simplify right side
   85,503.60x = 5,494,057,449.71
5. Step 5: Solve for x
   x = 5,494,057,449.71/85,503.60
6. Step 6: Final answer
   x = 64,255.28