Finding the Fourth Proportional to 69,018.66, 103,659.20 and 42,905.88

Step by Step Solution

1. Step 1: Write the proportion equation
   69,018.66 : 103,659.20 = 42,905.88 : x
2. Step 2: Convert to fraction form
   69,018.66/103,659.20 = 42,905.88/x
3. Step 3: Cross multiply
   69,018.66x = 103,659.20 × 42,905.88
4. Step 4: Simplify right side
   69,018.66x = 4,447,589,196.10
5. Step 5: Solve for x
   x = 4,447,589,196.10/69,018.66
6. Step 6: Final answer
   x = 64,440.39