Finding the Fourth Proportional to 1,030,128.14, 1,421,403.59 and 686,477.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030,128.14 : 1,421,403.59 = 686,477.10 : x
2. Step 2: Convert to fraction form
   1,030,128.14/1,421,403.59 = 686,477.10/x
3. Step 3: Cross multiply
   1,030,128.14x = 1,421,403.59 × 686,477.10
4. Step 4: Simplify right side
   1,030,128.14x = 975,761,014,392.79
5. Step 5: Solve for x
   x = 975,761,014,392.79/1,030,128.14
6. Step 6: Final answer
   x = 947,222.95