Finding the Fourth Proportional to 72,817.84, 109,149 and 51,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   72,817.84 : 109,149 = 51,978.16 : x
2. Step 2: Convert to fraction form
   72,817.84/109,149 = 51,978.16/x
3. Step 3: Cross multiply
   72,817.84x = 109,149 × 51,978.16
4. Step 4: Simplify right side
   72,817.84x = 5,673,364,185.84
5. Step 5: Solve for x
   x = 5,673,364,185.84/72,817.84
6. Step 6: Final answer
   x = 77,911.73