Finding the Fourth Proportional to 93,148.56, 128,695.32 and 64,980

Step by Step Solution

1. Step 1: Write the proportion equation
   93,148.56 : 128,695.32 = 64,980 : x
2. Step 2: Convert to fraction form
   93,148.56/128,695.32 = 64,980/x
3. Step 3: Cross multiply
   93,148.56x = 128,695.32 × 64,980
4. Step 4: Simplify right side
   93,148.56x = 8,362,621,893.60
5. Step 5: Solve for x
   x = 8,362,621,893.60/93,148.56
6. Step 6: Final answer
   x = 89,777.25