Finding the Fourth Proportional to 85,830.06, 128,780.64 and 46,340.76

Step by Step Solution

1. Step 1: Write the proportion equation
   85,830.06 : 128,780.64 = 46,340.76 : x
2. Step 2: Convert to fraction form
   85,830.06/128,780.64 = 46,340.76/x
3. Step 3: Cross multiply
   85,830.06x = 128,780.64 × 46,340.76
4. Step 4: Simplify right side
   85,830.06x = 5,967,792,730.89
5. Step 5: Solve for x
   x = 5,967,792,730.89/85,830.06
6. Step 6: Final answer
   x = 69,530.33