Finding the Fourth Proportional to 105,188.21, 145,171.15 and 64,900.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105,188.21 : 145,171.15 = 64,900.94 : x
2. Step 2: Convert to fraction form
   105,188.21/145,171.15 = 64,900.94/x
3. Step 3: Cross multiply
   105,188.21x = 145,171.15 × 64,900.94
4. Step 4: Simplify right side
   105,188.21x = 9,421,744,095.88
5. Step 5: Solve for x
   x = 9,421,744,095.88/105,188.21
6. Step 6: Final answer
   x = 89,570.34