Finding the Fourth Proportional to 1,148,900.48, 1,585,538.16 and 639,602.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,148,900.48 : 1,585,538.16 = 639,602.72 : x
2. Step 2: Convert to fraction form
   1,148,900.48/1,585,538.16 = 639,602.72/x
3. Step 3: Cross multiply
   1,148,900.48x = 1,585,538.16 × 639,602.72
4. Step 4: Simplify right side
   1,148,900.48x = 1,014,114,519,799.80
5. Step 5: Solve for x
   x = 1,014,114,519,799.80/1,148,900.48
6. Step 6: Final answer
   x = 882,682.65