Finding the Fourth Proportional to 99,929.25, 137,910.23 and 56,910.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99,929.25 : 137,910.23 = 56,910.56 : x
2. Step 2: Convert to fraction form
   99,929.25/137,910.23 = 56,910.56/x
3. Step 3: Cross multiply
   99,929.25x = 137,910.23 × 56,910.56
4. Step 4: Simplify right side
   99,929.25x = 7,848,548,419.03
5. Step 5: Solve for x
   x = 7,848,548,419.03/99,929.25
6. Step 6: Final answer
   x = 78,541.05