Finding the Fourth Proportional to 124,780.42, 172,260.45 and 77,061.45

Step by Step Solution

1. Step 1: Write the proportion equation
   124,780.42 : 172,260.45 = 77,061.45 : x
2. Step 2: Convert to fraction form
   124,780.42/172,260.45 = 77,061.45/x
3. Step 3: Cross multiply
   124,780.42x = 172,260.45 × 77,061.45
4. Step 4: Simplify right side
   124,780.42x = 13,274,640,054.65
5. Step 5: Solve for x
   x = 13,274,640,054.65/124,780.42
6. Step 6: Final answer
   x = 106,384.00