Finding the Fourth Proportional to 72,421.02, 108,136.10 and 64,875.87

Step by Step Solution

1. Step 1: Write the proportion equation
   72,421.02 : 108,136.10 = 64,875.87 : x
2. Step 2: Convert to fraction form
   72,421.02/108,136.10 = 64,875.87/x
3. Step 3: Cross multiply
   72,421.02x = 108,136.10 × 64,875.87
4. Step 4: Simplify right side
   72,421.02x = 7,015,423,565.91
5. Step 5: Solve for x
   x = 7,015,423,565.91/72,421.02
6. Step 6: Final answer
   x = 96,869.99