Finding the Fourth Proportional to 72,315.58, 99,725.40 and 56,394.22

Step by Step Solution

1. Step 1: Write the proportion equation
   72,315.58 : 99,725.40 = 56,394.22 : x
2. Step 2: Convert to fraction form
   72,315.58/99,725.40 = 56,394.22/x
3. Step 3: Cross multiply
   72,315.58x = 99,725.40 × 56,394.22
4. Step 4: Simplify right side
   72,315.58x = 5,623,936,147.19
5. Step 5: Solve for x
   x = 5,623,936,147.19/72,315.58
6. Step 6: Final answer
   x = 77,769.36