Finding the Fourth Proportional to 139,393.21, 209,058.28 and 64,472.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,393.21 : 209,058.28 = 64,472.24 : x
2. Step 2: Convert to fraction form
   139,393.21/209,058.28 = 64,472.24/x
3. Step 3: Cross multiply
   139,393.21x = 209,058.28 × 64,472.24
4. Step 4: Simplify right side
   139,393.21x = 13,478,455,602.15
5. Step 5: Solve for x
   x = 13,478,455,602.15/139,393.21
6. Step 6: Final answer
   x = 96,693.77