Finding the Fourth Proportional to 77,641.98, 107,164.71 and 72,388.86

Step by Step Solution

1. Step 1: Write the proportion equation
   77,641.98 : 107,164.71 = 72,388.86 : x
2. Step 2: Convert to fraction form
   77,641.98/107,164.71 = 72,388.86/x
3. Step 3: Cross multiply
   77,641.98x = 107,164.71 × 72,388.86
4. Step 4: Simplify right side
   77,641.98x = 7,757,531,189.13
5. Step 5: Solve for x
   x = 7,757,531,189.13/77,641.98
6. Step 6: Final answer
   x = 99,914.13