Finding the Fourth Proportional to 65,856.90, 90,858.06 and 41,978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   65,856.90 : 90,858.06 = 41,978.10 : x
2. Step 2: Convert to fraction form
   65,856.90/90,858.06 = 41,978.10/x
3. Step 3: Cross multiply
   65,856.90x = 90,858.06 × 41,978.10
4. Step 4: Simplify right side
   65,856.90x = 3,814,048,728.49
5. Step 5: Solve for x
   x = 3,814,048,728.49/65,856.90
6. Step 6: Final answer
   x = 57,914.19