Finding the Fourth Proportional to 64,780.63, 89,419.64 and 37,931.77

Step by Step Solution

1. Step 1: Write the proportion equation
   64,780.63 : 89,419.64 = 37,931.77 : x
2. Step 2: Convert to fraction form
   64,780.63/89,419.64 = 37,931.77/x
3. Step 3: Cross multiply
   64,780.63x = 89,419.64 × 37,931.77
4. Step 4: Simplify right side
   64,780.63x = 3,391,845,217.96
5. Step 5: Solve for x
   x = 3,391,845,217.96/64,780.63
6. Step 6: Final answer
   x = 52,358.94