Finding the Fourth Proportional to 1,058.50, 1,588.47 and 636.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.50 : 1,588.47 = 636.72 : x
2. Step 2: Convert to fraction form
   1,058.50/1,588.47 = 636.72/x
3. Step 3: Cross multiply
   1,058.50x = 1,588.47 × 636.72
4. Step 4: Simplify right side
   1,058.50x = 1,011,410.62
5. Step 5: Solve for x
   x = 1,011,410.62/1,058.50
6. Step 6: Final answer
   x = 955.51