Finding the Fourth Proportional to 99,804.78, 137,725.76 and 56,780.22

Step by Step Solution

1. Step 1: Write the proportion equation
   99,804.78 : 137,725.76 = 56,780.22 : x
2. Step 2: Convert to fraction form
   99,804.78/137,725.76 = 56,780.22/x
3. Step 3: Cross multiply
   99,804.78x = 137,725.76 × 56,780.22
4. Step 4: Simplify right side
   99,804.78x = 7,820,098,952.47
5. Step 5: Solve for x
   x = 7,820,098,952.47/99,804.78
6. Step 6: Final answer
   x = 78,353.95