Finding the Fourth Proportional to 105,031.69, 157,487.05 and 45,839.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,031.69 : 157,487.05 = 45,839.05 : x
2. Step 2: Convert to fraction form
   105,031.69/157,487.05 = 45,839.05/x
3. Step 3: Cross multiply
   105,031.69x = 157,487.05 × 45,839.05
4. Step 4: Simplify right side
   105,031.69x = 7,219,056,759.30
5. Step 5: Solve for x
   x = 7,219,056,759.30/105,031.69
6. Step 6: Final answer
   x = 68,732.18