Finding the Fourth Proportional to 123,780, 170,838 and 73,477.92

Step by Step Solution

1. Step 1: Write the proportion equation
   123,780 : 170,838 = 73,477.92 : x
2. Step 2: Convert to fraction form
   123,780/170,838 = 73,477.92/x
3. Step 3: Cross multiply
   123,780x = 170,838 × 73,477.92
4. Step 4: Simplify right side
   123,780x = 12,552,820,896.96
5. Step 5: Solve for x
   x = 12,552,820,896.96/123,780
6. Step 6: Final answer
   x = 101,412.35