Finding the Fourth Proportional to 99,929.31, 137,910.32 and 56,910.63

Step by Step Solution

1. Step 1: Write the proportion equation
   99,929.31 : 137,910.32 = 56,910.63 : x
2. Step 2: Convert to fraction form
   99,929.31/137,910.32 = 56,910.63/x
3. Step 3: Cross multiply
   99,929.31x = 137,910.32 × 56,910.63
4. Step 4: Simplify right side
   99,929.31x = 7,848,562,910.15
5. Step 5: Solve for x
   x = 7,848,562,910.15/99,929.31
6. Step 6: Final answer
   x = 78,541.15