Finding the Fourth Proportional to 106,980.63, 147,638.34 and 64,538.25

Step by Step Solution

1. Step 1: Write the proportion equation
   106,980.63 : 147,638.34 = 64,538.25 : x
2. Step 2: Convert to fraction form
   106,980.63/147,638.34 = 64,538.25/x
3. Step 3: Cross multiply
   106,980.63x = 147,638.34 × 64,538.25
4. Step 4: Simplify right side
   106,980.63x = 9,528,320,096.51
5. Step 5: Solve for x
   x = 9,528,320,096.51/106,980.63
6. Step 6: Final answer
   x = 89,065.84