Finding the Fourth Proportional to 78,699.89, 108,605.99 and 42,889.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78,699.89 : 108,605.99 = 42,889.89 : x
2. Step 2: Convert to fraction form
   78,699.89/108,605.99 = 42,889.89/x
3. Step 3: Cross multiply
   78,699.89x = 108,605.99 × 42,889.89
4. Step 4: Simplify right side
   78,699.89x = 4,658,099,071.67
5. Step 5: Solve for x
   x = 4,658,099,071.67/78,699.89
6. Step 6: Final answer
   x = 59,188.12