Finding the Fourth Proportional to 64,973.64, 89,678.43 and 42,272.58

Step by Step Solution

1. Step 1: Write the proportion equation
   64,973.64 : 89,678.43 = 42,272.58 : x
2. Step 2: Convert to fraction form
   64,973.64/89,678.43 = 42,272.58/x
3. Step 3: Cross multiply
   64,973.64x = 89,678.43 × 42,272.58
4. Step 4: Simplify right side
   64,973.64x = 3,790,938,606.45
5. Step 5: Solve for x
   x = 3,790,938,606.45/64,973.64
6. Step 6: Final answer
   x = 58,345.79