Finding the Fourth Proportional to 78,194.72, 107,970.83 and 72,224.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,194.72 : 107,970.83 = 72,224.21 : x
2. Step 2: Convert to fraction form
   78,194.72/107,970.83 = 72,224.21/x
3. Step 3: Cross multiply
   78,194.72x = 107,970.83 × 72,224.21
4. Step 4: Simplify right side
   78,194.72x = 7,798,106,998.82
5. Step 5: Solve for x
   x = 7,798,106,998.82/78,194.72
6. Step 6: Final answer
   x = 99,726.78