Finding the Fourth Proportional to 105,234.84, 145,156.50 and 64,379.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,234.84 : 145,156.50 = 64,379.88 : x
2. Step 2: Convert to fraction form
   105,234.84/145,156.50 = 64,379.88/x
3. Step 3: Cross multiply
   105,234.84x = 145,156.50 × 64,379.88
4. Step 4: Simplify right side
   105,234.84x = 9,345,158,051.22
5. Step 5: Solve for x
   x = 9,345,158,051.22/105,234.84
6. Step 6: Final answer
   x = 88,802.89