Finding the Fourth Proportional to 105,085.01, 145,038.90 and 64,256.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,085.01 : 145,038.90 = 64,256.12 : x
2. Step 2: Convert to fraction form
   105,085.01/145,038.90 = 64,256.12/x
3. Step 3: Cross multiply
   105,085.01x = 145,038.90 × 64,256.12
4. Step 4: Simplify right side
   105,085.01x = 9,319,636,963.07
5. Step 5: Solve for x
   x = 9,319,636,963.07/105,085.01
6. Step 6: Final answer
   x = 88,686.64