Finding the Fourth Proportional to 105,663.73, 145,819.56 and 57,917.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,663.73 : 145,819.56 = 57,917.07 : x
2. Step 2: Convert to fraction form
   105,663.73/145,819.56 = 57,917.07/x
3. Step 3: Cross multiply
   105,663.73x = 145,819.56 × 57,917.07
4. Step 4: Simplify right side
   105,663.73x = 8,445,441,663.89
5. Step 5: Solve for x
   x = 8,445,441,663.89/105,663.73
6. Step 6: Final answer
   x = 79,927.54