Finding the Fourth Proportional to 78,697.89, 108,603.09 and 42,887.91

Step by Step Solution

1. Step 1: Write the proportion equation
   78,697.89 : 108,603.09 = 42,887.91 : x
2. Step 2: Convert to fraction form
   78,697.89/108,603.09 = 42,887.91/x
3. Step 3: Cross multiply
   78,697.89x = 108,603.09 × 42,887.91
4. Step 4: Simplify right side
   78,697.89x = 4,657,759,549.64
5. Step 5: Solve for x
   x = 4,657,759,549.64/78,697.89
6. Step 6: Final answer
   x = 59,185.32