Finding the Fourth Proportional to 78,318.64, 108,076.82 and 42,507.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78,318.64 : 108,076.82 = 42,507.88 : x
2. Step 2: Convert to fraction form
   78,318.64/108,076.82 = 42,507.88/x
3. Step 3: Cross multiply
   78,318.64x = 108,076.82 × 42,507.88
4. Step 4: Simplify right side
   78,318.64x = 4,594,116,495.34
5. Step 5: Solve for x
   x = 4,594,116,495.34/78,318.64
6. Step 6: Final answer
   x = 58,659.30