Finding the Fourth Proportional to 105,126.74, 145,093.71 and 62,688

Step by Step Solution

1. Step 1: Write the proportion equation
   105,126.74 : 145,093.71 = 62,688 : x
2. Step 2: Convert to fraction form
   105,126.74/145,093.71 = 62,688/x
3. Step 3: Cross multiply
   105,126.74x = 145,093.71 × 62,688
4. Step 4: Simplify right side
   105,126.74x = 9,095,634,492.48
5. Step 5: Solve for x
   x = 9,095,634,492.48/105,126.74
6. Step 6: Final answer
   x = 86,520.66