Finding the Fourth Proportional to 105,415.74, 145,477.17 and 57,667.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,415.74 : 145,477.17 = 57,667.98 : x
2. Step 2: Convert to fraction form
   105,415.74/145,477.17 = 57,667.98/x
3. Step 3: Cross multiply
   105,415.74x = 145,477.17 × 57,667.98
4. Step 4: Simplify right side
   105,415.74x = 8,389,374,530.02
5. Step 5: Solve for x
   x = 8,389,374,530.02/105,415.74
6. Step 6: Final answer
   x = 79,583.70