Finding the Fourth Proportional to 86,142.79, 128,937.72 and 46,061.66

Step by Step Solution

1. Step 1: Write the proportion equation
   86,142.79 : 128,937.72 = 46,061.66 : x
2. Step 2: Convert to fraction form
   86,142.79/128,937.72 = 46,061.66/x
3. Step 3: Cross multiply
   86,142.79x = 128,937.72 × 46,061.66
4. Step 4: Simplify right side
   86,142.79x = 5,939,085,914.89
5. Step 5: Solve for x
   x = 5,939,085,914.89/86,142.79
6. Step 6: Final answer
   x = 68,944.67