Finding the Fourth Proportional to 72,196.88, 99,634.80 and 40,365.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,196.88 : 99,634.80 = 40,365.78 : x
2. Step 2: Convert to fraction form
   72,196.88/99,634.80 = 40,365.78/x
3. Step 3: Cross multiply
   72,196.88x = 99,634.80 × 40,365.78
4. Step 4: Simplify right side
   72,196.88x = 4,021,836,417.14
5. Step 5: Solve for x
   x = 4,021,836,417.14/72,196.88
6. Step 6: Final answer
   x = 55,706.51