Finding the Fourth Proportional to 64,699.89, 89,320.89 and 45,378.14

Step by Step Solution

1. Step 1: Write the proportion equation
   64,699.89 : 89,320.89 = 45,378.14 : x
2. Step 2: Convert to fraction form
   64,699.89/89,320.89 = 45,378.14/x
3. Step 3: Cross multiply
   64,699.89x = 89,320.89 × 45,378.14
4. Step 4: Simplify right side
   64,699.89x = 4,053,215,404.74
5. Step 5: Solve for x
   x = 4,053,215,404.74/64,699.89
6. Step 6: Final answer
   x = 62,646.40